what he and gundoc said.
First test at trade school was sharpen a drill to cut nor more than 0.1 of its size. as such I look with disdain on drill sharpening gadgets.
I consider myself relatively proficient at sharpening drills without guides at least up to maybe 5/8". Once they get bigger and the hole size is important then the guide and ruler come out
A big drill can cut way oversize if you get it wrong
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